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Seasonal affective disorder, or SAD, is a mood disorder characterized by depression related to a certain season of the year – especially winter. However, SAD is often not described as a separate mood disorder but as a “specifier,” referring to the seasonal pattern of major depressive episodes that can occur within major depression and manic depression.
SAD is a clinical diagnosis accepted in the medical community. Dr. Norman E. Rosenthal, Chief of Environmental Psychiatry Branch of the National Institute of Mental Health
Disorders, is the researcher credited with discovering SAD.
Decreased sunlight is thought to be part of the cause of SAD, and is under clinical investigation.
Specific treatment for SAD will be determined by your physician based on: